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With you on loathing Trump, but that quote is fictitious, manufactured in 2016. He didn't say that in PEOPLE or anywhere else.
Yes he did. Probably exactly those words, certainly the "...Republicans are dumbest voters..." part. It was not in the press, it was a TV interview. After that manthing became president, the clip became impossible to find...!!! Such remarks were made in the late '90s when he was still a Democrat. Several prominent individuals of the last 20 years have used every tool available to remove critical, unflattering, and often inaccurate, online stories.
Snopes of course, says it's fake. However, conclusion reached with the understanding that such was published in People magazine.